Green-sand core



v (No Model.) 3 Sheets-Sheet I.

0. P. BINGHAM. GREEN SAND GORE. No. isomo. Patented 001;. 24, 189s.

um l

(No Model.) 3 Sheets-Sheet 3.

C. I. BINGHAM. GREEN SAND GORE.

100.507,400. Patented 001;. 24,1803.

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i mlgnesses Inv/@maw brmey UNITED STATES PATENT OFFICE.

CHARLES F. BINGHAM, OFBUFFALO, NEW YORK.

GREEN-SAND CORE.

SPECIFICATION forming part of Letters Patent No. 507,406, dated October24, 1893.

Application filed April 4, 1892. Serial No.427'592. (No model.) i

.T0 all whom it may concern:

Be it known that I, CHARLES F. BINGHAM, a citizen of the United States,residing at Buffalo, in the county of Erie and State of New York, haveinvented new and useful Improvements in Green-Sand Cores, of which thefollowing is a specification.

This invention relates to the construction of green sand cores forcasting journal boxes and similar hollow articles having end openings ofsmaller diameter than the body of the casting and which require acore ofcomparatively small diameter at its ends for forming Athe end openingsof the casting and of much larger diameter between its ends for formingthe body portion thereof. The use of a green sand core having anordinary core barrel is impracticable for this purpose, because theportion of the sand core which is to form the body portion of thecasting is liable to break upon removing it from the core box. Owing tothis difficulty, it has been the custom to cast articles of theforegoing description by means of dry sand cores, and, as is well known,the preparation of a dry sand core requires more time and involves moreexpense than that of a'green sand core.

The object of my invention is to produce la core barrel which willpermit the use of a green sand core for forming such castings andthereby effect an important saving in time and expense.

My invention has the further object to pro- Ivide a box for forming sucha core which fa# cilitates the removal of the core from the box. In theaccompanying drawings consisting of three sheets: Figure l is aperspective View respectively. Fig. 8 is a perspective view of the corebarrel. Fig. 9 is a vertical cross section in line .QJ-Z, Fig. 8. Figs.10 and 1l are longitudinal sections in lines o--fv and w-w, Fig. 9.

Like letters of reference refer to like parts in the several gures.

Although my improvements may be used for forming cores for casting allhollow articles having openings in their walls which are smaller thanthe cavity in the body of the box, I have selected a journal box toillustrate my invention. This journal box consists essentially of ahollow body A, having an oil opening h in its outer end, an axleopeningc in its inner end, and a vertical pocket or guide-way c whichreceives the usual dustguard, the oil and axle openings being of smallerdimensions than the interior of the journal box.

d represents the bottom of the core box, d the front end wall, and d2the rear end wall thereof, both of which walls are rigidly secured tothe bottom.

l e c represent the upright side walls of the core box which are hingedat their lower ends to the longitudinal edges of the bottom d, as shownat e.

f represents the top of the core box which rests upon the upper ends ofthe side and end Walls and which is provided at its longitudinal edgeswith depending ribs or flanges f which engage against the outer sides ofthe side walls and hold the latter in an upright position in filling thecore box with sand. The top is provided with an opening which is closedby a removable cover f 2 and which permits sand to be introduced intothe core box after the top is in place.

f3 represents removable pieces arranged in the top and bottom of thecore box and extending into the latter for forming part of theguide-ways c of the journal box. The inner sides of the top, bottom,side and end walls are shaped to correspond to the interior surface ofthe journal box or other hollow ob- IOO aid in supporting the green sandcore on the barrel. The latter is arranged with its end portions inthose portions of the core which form the oil and journal openings atopposite ends of the journal box, and the wings are arranged on the corebarrel between its ends, so as to support those portions of the corewhich form the hollow body of the journal box. These wings extendoutwardly from the core barrel beyond the inner edges of the oil andjournal openings of the box, so as to reliably support that portion ofthe core forming the hollow body and prevent the same from breaking byits own weight. The core barrel is preferably provided with two upperwings h h and two lower wings h h arranged equidistant, or nearly so,around the core barrel. The upper wings consist of longitudinal barsseparated from the surface of the barrel by an intervening space andhaving dove-tails t' t" at their front and rear ends. These dovetailsengage with correspondingly shaped ways or grooves i2 formed on theupper sides of the core barrel and its rectangular extension. Each ofthe lower wings is provided with an openingj andthe inner longitudinalbars of the wings are provided with dove-tails 7o which engage withsimilarly shaped ways k formed on the lower side of the core barrel. Thedove-tails and their ways are preferably tapered toward the rear end ofthe core barrel, as represented in Figs. l0 and l1, which enables thewings to be firmly wedged upon the core barrel by moving them rearwardlyin their ways. If desired, a stop 7a2 may be formed on the core barrelat the rear end of the dove-tail ways, as represented in Figs. 8 and 11,whereby the wings are prevented from being wedged too tightly in theguides.

Preparatory to molding the green sand core, the top of the core box isremoved, the side walls are swung downwardly, as indicated by dottedlines in Fig. 7, and the core barrel with its wings is placed in thecore box. Molding sand is then packed underneath the core barrel untilthe space below the same is filled, when the side walls are raised andheld in an upright position by aclamp of the usual construction. Sand isnext rammed between the side Walls and the core barrel from above, andthe top placed upon the side and end walls, so as to close the upperside of the core box. The cover of the top is then removed and sand isintroduced through the coveropening to lill the space between the upperside of the core barreland the top, after which the cover is replaced.The sand located between the longitudinal bars of the upper wings andthe core barrel and in the openings of the lower wings, forms an anchor,whereby those portions of the core forming the cavity of the journal boxare sustained and prevented from breaking from the weight of the sand.The sliding pieces arrangedin the bottom and top of the core box arenext removed and the top is raised, which permits the side walls toswing downwardly.' This leaves the finished core exposed on its top andsides and permits the same to be freely raised from the bottom andplaced in the previously prepared mold.

In order to prevent any accidental movement or displacement of the corebarrel in ramming the sand between the under side of the core barrel andthe bottom of the core box, the end walls of the latter are preferablyprovided with hinged hooksZ which engage over projecting lugs Z formedon the ends of the core barrel and hold the latter securely in the seatsg g2 in the end walls of the core box. The core barrel is readilyreleased from these hooks by swinging the hooks backwardly when the coreis completed and ready to be removed from the core box.

Upon removing the cast journal box from the flask and withdrawing thecore barrel through the journal opening of the box, the wings, strikingagainst the rear contracted portion of the journal box, become detachedfrom the core barrel by the outward movement thereof, the wings and thesand core collapsing inside the box as soon as the core barrel is whollywithdrawn, in which condi tion they can be easily removed.

By constructing the core box as described, the molding of the core isfacilitated and the liability of breaking the core in removing the samefrom the core box is avoided.

I claim as my inventionl. The combination with the core barrel havinglongitudinal dove-tail ways, of longitudinal anchoring wings projectingbeyond the surface of the barrel and having longitudinal dove-tailtenons which engage with the corresponding ways of the barrel,substantially as set forth.

2. The combination with the core barrel provided with tapering dove-tailways, of wings provided with tapering dove-tails engaging with saidways, substantially as set forth.

3. The combination with a core barrel having wings or projectionsbetween its ends, of a core box havingabottom, end walls secured to thebottom and provided with seats for supporting the ends of the corebarrel, movable side walls hinged or pivoted to the bottom, and aremovable top or cover, substantially as set forth.

4. A core box for forming sand cores, provided with a bottom and endywalls, movable side walls hinged or pivoted to the bottom, and aremovable top or cover, substantially as set forth.

8VtTitness my hand this 30th day of March, 1 92.

CHARLES F. BIN GHAM.

Witnesses:

FRED.. C. GEYER, ALICE G. CONNELLY.

IXO

